NAJDER-STEFANIAK, K. Sustainable development as open system of activity. Studia Ecologiae et Bioethicae, [S. l.], v. 17, n. 3, p. 13–22, 2019. DOI: 10.21697/seb.2019.17.3.02. Disponível em: https://czasopisma.uksw.edu.pl/index.php/seb/article/view/6612. Acesso em: 2 dec. 2024.